.NET /实体框架-- System.Data.UpdateException不够精确？

Question

我参与了一个使用实体框架和MS SQL Server2005的小型.NET迁移项目。当持久化不使用db模式的数据时(例如，字符串太长)，我得到一个异常System.Data.UpdateException，它显示“字符串或二进制数据将被截断”。但没有信息表明它与哪个领域相关。有没有人知道怎么弄到这个？

thx

下面是堆栈跟踪：

   at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)
   at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache)
   at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options)
   at System.Data.Objects.ObjectContext.SaveChanges()
   at HAM.Inventory.Data.Repository.DocumentRepository.Save(Document document) in D:\ludewigg\Documents\Projects\HAM\src\VBS-HAM-Inventory\Main\HAM.Inventory.Data\Repository\DocumentRepository.cs:line 177
   at HAM.Inventory.Business.Managers.DocumentManager.Save(Document document) in D:\ludewigg\Documents\Projects\HAM\src\VBS-HAM-Inventory\Main\HAM.Inventory.Business\Managers\DocumentManager.cs:line 75
   at HAM.Inventory.MigrationClient.Common.Migration.SaveItem(ItemBase item) in D:\ludewigg\Documents\Projects\HAM\src\VBS-HAM-Inventory\Main\HAM.Inventory.MigrationClient\Common\Migration.cs:line 143
   at HAM.Inventory.MigrationClient.Common.Migration.SaveAndClearItems(List`1 items) in D:\ludewigg\Documents\Projects\HAM\src\VBS-HAM-Inventory\Main\HAM.Inventory.MigrationClient\Common\Migration.cs:line 76

和内部异常：

at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()
   at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe)
   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.Execute(UpdateTranslator translator, EntityConnection connection, Dictionary`2 identifierValues, List`1 generatedValues)
   at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)

Answer 1

看看StateEntries属性。它应该包含所有失败的对象。